/*************************************************************************/
/*  parallax_background.cpp                                              */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "parallax_background.h"
#include "parallax_layer.h"



void ParallaxBackground::_notification(int p_what) {

	switch(p_what) {


		case NOTIFICATION_ENTER_SCENE: {

			group_name = "__cameras_"+itos(get_viewport().get_id());
			add_to_group(group_name);

		} break;
		case NOTIFICATION_EXIT_SCENE: {

			remove_from_group(group_name);
		} break;
	}

}

void ParallaxBackground::_camera_moved(const Matrix32& p_transform) {


	set_scroll_offset(p_transform.get_origin());
	set_scroll_scale(p_transform.get_scale().dot(Vector2(0.5,0.5)));
}


void ParallaxBackground::set_scroll_scale(float p_scale) {

	scale=p_scale;
}

float ParallaxBackground::get_scroll_scale() const{

	return scale;
}


void ParallaxBackground::set_scroll_offset(const Point2& p_ofs) {

	offset=p_ofs;

	_update_scroll();
}

void ParallaxBackground::_update_scroll() {

	if (!is_inside_scene())
		return;

	Vector2 ofs = base_offset+offset*base_scale;

	Size2 vps = get_viewport_size();

	ofs = -ofs;
	if (limit_begin.x < limit_end.x) {

		if (ofs.x < limit_begin.x)
			ofs.x=limit_begin.x;
		else if (ofs.x+vps.x > limit_end.x)
			ofs.x=limit_end.x-vps.x;
	}


	if (limit_begin.y < limit_end.y) {

		if (ofs.y < limit_begin.y)
			ofs.y=limit_begin.y;
		else if (ofs.y+vps.y > limit_end.y)
			ofs.y=limit_end.y-vps.y;
	}
	ofs = -ofs;

	for(int i=0;i<get_child_count();i++) {

		ParallaxLayer *l=get_child(i)->cast_to<ParallaxLayer>();
		if (!l)
			continue;

		l->set_base_offset_and_scale(ofs,scale);
	}
}

Point2 ParallaxBackground::get_scroll_offset() const {

	return offset;
}

void ParallaxBackground::set_scroll_base_offset(const Point2& p_ofs) {

	base_offset=p_ofs;
	_update_scroll();
}

Point2 ParallaxBackground::get_scroll_base_offset() const{

	return base_offset;
}

void ParallaxBackground::set_scroll_base_scale(const Point2& p_ofs) {

	base_scale=p_ofs;
	_update_scroll();
}

Point2 ParallaxBackground::get_scroll_base_scale() const{

	return base_scale;
}


void ParallaxBackground::set_limit_begin(const Point2& p_ofs) {

	limit_begin=p_ofs;
	_update_scroll();
}

Point2 ParallaxBackground::get_limit_begin() const {

	return limit_begin;
}

void ParallaxBackground::set_limit_end(const Point2& p_ofs) {

	limit_end=p_ofs;
	_update_scroll();

}

Point2 ParallaxBackground::get_limit_end() const {

	return limit_end;
}

void ParallaxBackground::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("_camera_moved"),&ParallaxBackground::_camera_moved);
	ObjectTypeDB::bind_method(_MD("set_scroll_offset","ofs"),&ParallaxBackground::set_scroll_offset);
	ObjectTypeDB::bind_method(_MD("get_scroll_offset"),&ParallaxBackground::get_scroll_offset);
	ObjectTypeDB::bind_method(_MD("set_scroll_base_offset","ofs"),&ParallaxBackground::set_scroll_base_offset);
	ObjectTypeDB::bind_method(_MD("get_scroll_base_offset"),&ParallaxBackground::get_scroll_base_offset);
	ObjectTypeDB::bind_method(_MD("set_scroll_base_scale","scale"),&ParallaxBackground::set_scroll_base_scale);
	ObjectTypeDB::bind_method(_MD("get_scroll_base_scale"),&ParallaxBackground::get_scroll_base_scale);
	ObjectTypeDB::bind_method(_MD("set_limit_begin","ofs"),&ParallaxBackground::set_limit_begin);
	ObjectTypeDB::bind_method(_MD("get_limit_begin"),&ParallaxBackground::get_limit_begin);
	ObjectTypeDB::bind_method(_MD("set_limit_end","ofs"),&ParallaxBackground::set_limit_end);
	ObjectTypeDB::bind_method(_MD("get_limit_end"),&ParallaxBackground::get_limit_end);


	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2,"scroll/offset"),_SCS("set_scroll_offset"),_SCS("get_scroll_offset"));
	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2,"scroll/base_offset"),_SCS("set_scroll_base_offset"),_SCS("get_scroll_base_offset"));
	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2,"scroll/base_scale"),_SCS("set_scroll_base_scale"),_SCS("get_scroll_base_scale"));
	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2,"scroll/limit_begin"),_SCS("set_limit_begin"),_SCS("get_limit_begin"));
	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2,"scroll/limit_end"),_SCS("set_limit_end"),_SCS("get_limit_end"));

}





ParallaxBackground::ParallaxBackground() {

	base_scale=Vector2(1,1);
	scale=1.0;
	set_layer(-1); //behind all by default
}
